Ytterbium is the 70th element on the periodic table. It is a member of the lanthanide series at the bottom of the periodic table. This means that it has f orbital electrons in its valence shell. It is most commonly found in the +2 or +3 oxidation state. It combines with halogens (F, Cl, Br, I) to form dihalides and trihalides. As an example, YbCl2 is in the +2 oxidation state and YbCl3 is in the +3 oxidation state. Ytterbium also forms oxides with oxygen. Yb2O3 and YbO are the two types of oxides.